Novel slurry mixing and feeding device of aluminum ash treatment sealed reaction system

Abstract

The utility model belongs to the technical field of aluminum ash treatment, and particularly relates to a novel slurry mixing and feeding device of an aluminum ash treatment sealing reaction system, which comprises a tank body, a feeding part arranged at the top of the tank body, a discharging pipe arranged at the bottom of the tank body and a motor arranged at the top of the tank body, a second stirring shaft is connected below the first stirring shaft through a reversing device, and a plurality of stirring blades are fixedly arranged on the second stirring shaft; a plurality of stirring rods are fixedly arranged on the first stirring shaft, scrapers are fixedly arranged at the ends of the stirring rods, and the sides, away from the first stirring shaft, of the scrapers are close to the inner wall of the tank body. The slurry is stirred through the cooperation of the stirring rod and the scraping plate, the caked slurry on the inner wall of the tank body is scraped off, the caked slurry scraped off by the scraping plate is crushed through the stirring blade arranged at one end close to the discharging pipe, and meanwhile, the stirring is sufficient and rapid through the upper stirring device and the lower stirring device which rotate reversely.

Description

Technical Field

[0001] The utility model belongs to the technical field of aluminum ash treatment, and in particular relates to a novel slurry mixing and feeding device for an aluminum ash treatment sealed reaction system. Background Art

[0002] With the rapid development of the aluminum industry, aluminum ash, a major solid waste residue, has become increasingly voluminous, both in stock and in volume. Aluminum ash is produced in all aluminum melting processes and is the result of cooling aluminum slag from electrolytic aluminum, recycled aluminum, or cast aluminum production. Aluminum ash contains significant amounts of nitrides and nitrogen oxides, making it highly unstable and prone to chemical reactions, forming hazardous substances. This ash needs to be recycled and reused.

[0003] The aluminum ash treatment method is to send the raw aluminum ash and raw water into the batching tank for stirring and batching, and the slurry after batching is sent to the reactor, and the reactor is sealed by the batching tank to prevent air and raw materials from mixing into the reactor, so that the aluminum nitride in the aluminum ash reacts with water to generate ammonia and aluminum hydroxide slurry, and the ammonia enters the ammonia absorption system for recycling.

[0004] Since there is a risk of explosion when the combustible gas generated during the hydrolysis of aluminum ash comes into contact with oxygen in the air, the aluminum ash and water mixed slurry in the batching tank cannot stay in the batching tank for a long time. At the same time, if the residence time is too short, the aluminum ash and water cannot be fully mixed. It is necessary to ensure that the aluminum ash and water stay in the batching tank for about one minute. Therefore, it is necessary to ensure that the aluminum ash and water in the batching tank are quickly stirred and mixed, and the mixed slurry is transported to the reactor as soon as possible.

[0005] Currently, most batching tanks use stirring blades to stir and mix the slurry. On the one hand, the stirring effect is poor and cannot ensure the rapid and sufficient mixing of the slurry. On the other hand, the slurry easily forms ash blocks on the inner wall of the batching tank, which will fall off and cause the discharge pipe to be blocked, making production impossible. Summary of the Invention

[0006] In order to solve the problems that the existing mixing tank uses stirring blades to mix aluminum ash and water slowly, the stirring is not sufficient, and the mixed slurry is easy to agglomerate on the inner wall of the mixing tank, which causes the discharge pipe to be blocked after falling off and affects production, the utility model provides a novel slurry mixing and feeding device for an aluminum ash processing sealed reaction system, which stirs the slurry through the cooperation of a stirring rod and a scraper, and at the same time the scraper scrapes the inner wall of the mixing tank, and a stirring blade is arranged near one end of the discharge pipe, which, on the one hand, breaks up the agglomerates scraped by the scraper, and on the other hand, ensures sufficient and rapid stirring through the upper and lower counter-rotating stirring devices.

[0007] In order to achieve the above purpose, the technical solution of the utility model is:

[0008] A new type of slurry mixing and feeding device for a sealed reaction system for aluminum ash processing includes a tank body, and is characterized in that a feeding part is provided on the top of the tank body and a discharge pipe is provided on the bottom; a motor is provided on the top of the tank body, and the motor output shaft extends into the tank body and is fixedly connected to a first stirring shaft; a second stirring shaft is provided below the first stirring shaft; a reversing device is connected between the first stirring shaft and the second stirring shaft to realize reverse rotation of the first stirring shaft and the second stirring shaft; a plurality of stirring blades are fixedly provided on the second stirring shaft, and the stirring blade at the lowest end is provided close to the discharge pipe; the motor drives the first stirring shaft to rotate, drives the second stirring shaft to rotate in the reverse direction, and drives the stirring blade to rotate in the reverse direction.

[0009] A plurality of stirring rods are fixedly provided on the first stirring shaft, and scrapers are fixedly provided on the ends of the stirring rods. The scrapers are close to the inner wall of the tank at a side away from the first stirring shaft, and the first stirring shaft drives the stirring rods and the scrapers to rotate.

[0010] Preferably, the feed part includes a water inlet pipe, an ash inlet pipe and an exhaust pipe connected to the interior of the tank body. The water inlet pipe and the ash inlet pipe are used to add water and aluminum ash into the tank body, and the exhaust pipe discharges combustible gas generated by hydrolysis.

[0011] Preferably, a radar level gauge is provided on the top of the tank body, and the radar level gauge is used to detect the liquid level of the slurry in the tank body.

[0012] Preferably, the reversing device includes a box body, a cover body, a first bevel gear, a second bevel gear and a third bevel gear, a plurality of connecting rods are fixedly connected between the inner wall of the tank and the box body, the top of the box body is threadedly connected to the cover body, and a second bevel gear is rotatably provided on the inner side wall of the box body, the first stirring shaft passes through the cover body and is fixedly connected to the first bevel gear, the upper end of the second stirring shaft passes through the bottom side wall of the box body and is fixedly connected to the third bevel gear, the first bevel gear and the third bevel gear are both meshed with the second bevel gear, and the rotation of the first stirring shaft drives the first bevel gear to rotate, drives the second bevel gear to rotate, and drives the third bevel gear to rotate in the opposite direction, so that the second stirring shaft rotates in the opposite direction to the first stirring shaft.

[0013] Preferably, the second bevel gear is fixedly connected to the rotating rod, the rotating rod is fixedly connected to the circular plate, and a groove body matching the circular plate and the end of the rotating rod is opened on the inner wall of the box. The circular plate cooperates with the groove body on the inner wall of the box to realize the rotational connection between the second bevel gear and the box.

[0014] Preferably, the tank body has a height of 2500-3000 mm and a diameter of 400-500 mm. Within this range, the tank body can take into account both slurry forming and safety.

[0015] Preferably, the tank body has a height of 2500 mm and a diameter of 500 mm.

[0016] Through the above technical solution, the beneficial effects of the utility model are:

[0017] 1. The utility model drives the first stirring shaft and the second stirring shaft to rotate through the motor, and then drives the stirring rod and the stirring blade to rotate, so as to achieve uniform mixing of the slurry in the tank and ensure rapid and sufficient hydrolysis.

[0018] 2. The utility model drives the scraper to rotate by rotating the stirring rod. On the one hand, when the scraper rotates, the multiple perforations opened on it ensure the stirring effect of the slurry. On the other hand, the scraper will scrape off the lumps on the inner wall of the tank, and the fallen lumps will be crushed by the stirring blades and discharged to avoid clogging the discharge pipe.

[0019] 3. The utility model realizes the reverse rotation of the second stirring shaft and the first stirring shaft through the reverse device, and then the stirring rod and the stirring blade rotate in the reverse direction, and the slurry in the tank body is fully mixed and stirred under the action of the upper and lower reverse rotations, thereby further improving the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a structural schematic diagram of the reverse device of the utility model.

[0022] Figure 3 This is a schematic structural diagram of the scraper of the utility model.

[0023] The numbers in the accompanying drawings are: 1 for the tank body, 2 for the discharge pipe, 3 for the motor, 4 for the first stirring shaft, 5 for the second stirring shaft, 6 for the stirring blade, 7 for the stirring rod, 8 for the scraper, 9 for the water inlet pipe, 10 for the ash inlet pipe, 11 for the exhaust pipe, 12 for the radar level gauge, 13 for the perforation, 14 for the box body, 15 for the cover body, 16 for the first bevel gear, 17 for the second bevel gear, 18 for the third bevel gear, 19 for the connecting rod, 20 for the rotating rod, and 21 for the circular plate. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] like Figures 1 to 3As shown, this embodiment provides a new type of slurry mixing and feeding device for a sealed reaction system for aluminum ash treatment, including a tank body 1, which is used to mix water and aluminum ash into slurry and transport it to a reactor for reaction. The slurry reacts in the reactor to generate a large amount of combustible gas, which may explode when in contact with air. Therefore, it is necessary to ensure that the reactor is sealed. Therefore, in order to prevent air from entering the reactor and ensure the continuity of aluminum ash treatment, the slurry level in the tank body 1 needs to be ensured to be within a certain height range. A feeding part is provided on the top of the tank body 1 and a discharge pipe 2 is provided on the bottom. The feeding part includes a tank body 1 and a discharge pipe 2. The water inlet pipe 9, the ash inlet pipe 10 and the exhaust pipe 11 are connected to the tank body 1. Water is added to the tank body 1 through the water inlet pipe 9, and aluminum ash is added to the tank body 1 through the ash inlet pipe 10. Because water and aluminum ash will mix with air when heating the tank body 1, and the aluminum nitride, aluminum carbide and metallic aluminum in the aluminum ash will hydrolyze to produce ammonia, methane, hydrogen and other combustible gases. The generated combustible gases are transported to the drying furnace for combustion through the exhaust pipe 11. However, when the slurry stays in the tank body 1 for a long time, the content of the generated combustible gas is high, which reacts with the oxygen in the air and has the risk of explosion. When water and aluminum ash are in the tank body 1, the combustible gas content is high and reacts with the oxygen in the air. The residence time in the tank body 1 is too short, and it is impossible to ensure that the slurry is mixed into a slurry. Therefore, the height and diameter of the tank body 1 need to be set. The height of the tank body 1 is 2500-3000mm and the diameter is 400-500mm. When the height of the tank body 1 is lower than 2500mm, the slurry level in the tank body 1 cannot be guaranteed. In addition, in order to ensure the residence time of aluminum ash and water in the tank body 1, when the height of the tank body 1 is increased, the diameter of the tank body 1 needs to be reduced. When the height of the tank body 1 is higher than 3000mm, the diameter of the tank body 1 is less than 400mm. Since the diameter of the tank body 1 is too small, it is impossible to ensure the mixing of aluminum ash and water. The stirring effect of ash and water, and the stratification of aluminum ash and water will occur, resulting in the aluminum ash and water being transported to the reactor before they are mixed into a slurry. Therefore, the optimal height of the tank body 1 is set at 2500-3000mm, and the corresponding diameter of the tank body 1 is between 400-500mm. The height of the tank body 1 is 2500mm and the diameter is 500mm. When the height of the tank body 1 is 2500mm and the diameter is 500mm, it can ensure that the aluminum ash and water are fully mixed into a slurry in the tank body 1 and the residence time is closer to one minute, thereby avoiding the generation of more combustible gas in the tank body 1.

[0026] The motor 3 is arranged on the top of the tank body 1, and the output shaft of the motor 3 extends into the tank body 1 and is fixedly connected to the first stirring shaft 4. A second stirring shaft 5 is arranged below the first stirring shaft 4. The motor 3 drives the first stirring shaft 4 and the second stirring shaft 5 to rotate. A reversing device is connected between the first stirring shaft 4 and the second stirring shaft 5 to realize the reverse rotation of the first stirring shaft 4 and the second stirring shaft 5. The reversing device includes a box body 14, a cover body 15, a first bevel gear 16, a second bevel gear 17 and a third bevel gear 18. A plurality of connecting rods 19 are fixedly connected between the inner wall of the tank body 1 and the box body 14, and the box body 14 is supported and fixed by the connecting rods 19. The top of the box body 14 is threadedly connected to the cover body 15. The first stirring shaft 4 penetrates The cover body 15 is fixedly connected to the first bevel gear 16. When disassembling and inspecting the internal structure of the box body 14, the cover body 15 is rotated to raise the cover body 15 along the axial direction of the first stirring shaft 4 and separate from the box body 14 to open the box body 14. A second bevel gear 17 is rotatably provided on the inner side wall of the box body 14. The upper end of the second stirring shaft 5 passes through the bottom side wall of the box body 14 and is fixedly connected to the third bevel gear 18. The first bevel gear 16 and the third bevel gear 16 are both meshed with the second bevel gear 17. The first stirring shaft 4 drives the first bevel gear 16 to rotate, drives the second bevel gear 17 meshed with it to rotate, and drives the third bevel gear 18 to rotate in the opposite direction of the first bevel gear 16, thereby realizing the reverse rotation of the second stirring shaft 5 and the first stirring shaft 4.

[0027] A plurality of stirring rods 7 are fixedly provided on the first stirring shaft 4, and a scraper 8 is fixedly provided at the end of the stirring rod 7. The scraper 8 is close to the inner wall of the tank body 1 on the side away from the first stirring shaft 4, and the distance between the scraper 8 and the inner wall of the tank body 1 is less than or equal to 1 mm. A plurality of perforations 13 are provided on the scraper 8. When the first stirring shaft 4 rotates, the stirring rod 7 and the scraper 8 are driven to rotate to achieve stirring of the aluminum ash and water in the tank body 1 to mix them into slurry. At the same time, the scraper 8 is used to scrape off the slurry lumps on the inner wall of the tank body 1 to make them fall off. A plurality of stirring blades 6 are fixedly provided on the mixing shaft 5, and the stirring blade 6 at the lower end is provided close to the discharge pipe 2. On the one hand, the lumps fallen off the inner wall of the tank body 1 are crushed by the rotating stirring blade 6 to avoid clogging the discharge pipe 2 during transportation in the discharge pipe 2. On the other hand, the slurry near the discharge pipe 2 is stirred to ensure that the slurry entering the discharge pipe 2 is evenly mixed. At the same time, since the second stirring shaft 5 rotates in the opposite direction to the first stirring shaft 4, the aluminum ash and water entering the tank body 1 are more fully and quickly mixed to form a slurry under the action of the upper and lower reverse stirring.

[0028] A radar level gauge 12 is provided on the top of the tank body 1. The radar level gauge 12 adopts an 80G radar level gauge with model GDRD82-PDSBFXXBAMB to ensure the liquid level detection of the aluminum ash and water mixture in the tank body 1 and ensure that the liquid level height is between 600mm-1500mm. When the liquid level is too high, the feed amount of aluminum ash and water is reduced. When the liquid level is low, the feed amount of aluminum ash and water is increased.

[0029] The second bevel gear 17 is fixedly connected to the rotating rod 20, and the rotating rod 20 is fixedly connected to the circular plate 21. A groove body matching the circular plate 21 and the end of the rotating rod 20 is opened on the inner wall of the box body 14. The circular plate 21 cooperates with the groove body to realize the rotational connection between the rotating rod 20 and the box body 14, thereby realizing the rotational connection between the second bevel gear 17 and the inner wall of the box body 14.

[0030] During use, aluminum ash and water are first added into the tank body 1 through the ash inlet pipe 10 and the water inlet pipe 9, and stirred to form a slurry. The combustible gas generated during the mixing and stirring process is transported to the drying furnace for combustion through the exhaust pipe 11. The size of the tank body 1 is designed to be 2500 mm in height and 500 mm in diameter, and the liquid level of the aluminum ash and water mixture entering the tank body 1 is between 600-1500 mm. The radar level meter 12 is used to detect and feedback the liquid level to ensure the liquid level, so that the aluminum ash and water stay in the tank body 1 for nearly one minute. While ensuring that the aluminum ash and water can be fully mixed and stirred into a slurry, it avoids too much combustible gas from staying in the tank body 1. At the same time, the mixed slurry is transported to the reactor through the discharge pipe 2 for reaction.

[0031] While adding aluminum ash and water into the tank body 1, start the motor 3, which drives the first stirring shaft 4 to rotate, and drives the stirring rod 7 and the scraper 8 to rotate, so as to achieve mixing and stirring of the aluminum ash and water, ensuring that they are mixed into slurry. At the same time, the slurry agglomerated on the inner wall of the tank body 1 is scraped off by the scraper 8.

[0032] The second stirring shaft 5 and the first stirring shaft 4 are rotated in opposite directions by the reversing device, driving the stirring blades 6 to rotate to crush the scraped agglomerated slurry. At the same time, the two stirring systems in reverse directions further ensure that the aluminum ash and water are fully and quickly mixed, ensuring that the aluminum ash and water are mixed into a slurry within a residence time of about one minute. At the same time, the slurry near the discharge pipe 2 is further stirred by the stirring blades 6 to ensure that the slurry entering the discharge pipe 2 is evenly mixed.

[0033] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A novel slurry mixing and feeding device for a sealed reaction system for aluminum ash treatment, comprising a tank body (1), characterized in that: A feeding portion is provided at the top of the tank body (1) and a discharge pipe (2) is provided at the bottom. A motor (3) is provided at the top of the tank body (1). The output shaft of the motor (3) extends into the tank body (1) and is fixedly connected to a first stirring shaft (4). A second stirring shaft (5) is provided below the first stirring shaft (4). A reversing device is connected between the first stirring shaft (4) and the second stirring shaft (5) to realize reverse rotation of the first stirring shaft (4) and the second stirring shaft (5). A plurality of stirring blades (6) are fixedly provided on the second stirring shaft (5), and the stirring blade (6) at the lowest end is provided close to the discharge pipe (2). A plurality of stirring rods (7) are fixedly provided on the first stirring shaft (4), and scrapers (8) are fixedly provided at the ends of the stirring rods (7), with the side of the scrapers (8) away from the first stirring shaft (4) being close to the inner wall of the tank body (1).

2. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 1 is characterized in that: The feed portion comprises a water inlet pipe (9), an ash inlet pipe (10), and an exhaust pipe (11) that are in communication with the interior of the tank body (1).

3. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 1 is characterized in that: A radar level gauge (12) is provided on the top of the tank body (1).

4. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 1 is characterized in that: The scraper (8) is provided with a plurality of perforations (13).

5. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 1 is characterized in that: The reversing device comprises a box body (14), a cover body (15), a first bevel gear (16), a second bevel gear (17) and a third bevel gear (18); a plurality of connecting rods (19) are fixedly connected between the inner wall of the tank body (1) and the box body (14); the top of the box body (14) is threadedly connected to the cover body (15); a second bevel gear (17) is rotatably provided on the inner side wall of the box body (14); the first stirring shaft (4) passes through the cover body (15) and is fixedly connected to the first bevel gear (16); the upper end of the second stirring shaft (5) passes through the bottom side wall of the box body (14) and is fixedly connected to the third bevel gear (18); the first bevel gear (16) and the third bevel gear (18) are both meshed with the second bevel gear (17).

6. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 5 is characterized in that: The second bevel gear (17) is fixedly connected to the rotating rod (20), and the rotating rod (20) is fixedly connected to the circular plate (21). A groove body matching the circular plate (21) and the end of the rotating rod (20) is provided on the inner wall of the box body (14).

7. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 1 is characterized in that: The tank body (1) has a height of 2500-3000 mm and a diameter of 400-500 mm.

8. The slurry mixing and feeding device of the novel aluminum ash treatment sealed reaction system according to claim 7 is characterized in that: The tank body (1) has a height of 2500 mm and a diameter of 500 mm.

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